Starting position #807
Back-rank setup: RKBQNRNB
SP-807 · RampartGuard — King pushed to the b- or g-file, knights off the edges — 144 positions here.
Move the pieces right on the board — full Chess960 rules, castle by dropping the king on the rook.
Position features
The king starts on b1, the rooks on a1 and f1, the queen on d1.
From b1 the king makes the longest journey Chess960 allows when castling short: five squares to g1.
A bishop starts in the corner on h1: it has a single diagonal, which the g-pawn unlocks, running out to a8.
One second-rank pawn starts with no defender at all: h2.
The setup belongs to the RampartGuard family; read right to left it becomes position 146.
The engine's main line opens with a4.
Every sentence here is computed from the setup itself and can be checked on the board.
Balance
MBI 7 Morozov Balance Index: 7 of 100 — class D — largest edge.
- Engine evaluation of the starting position: +47 centipawns for White (depth 46, 400 000 000 nodes).
- Rank 888 of 960 by balance — 1 is the most balanced start.
- Balance band L — large edge · dynamics along the play-out: equalizing
- Evaluation along the engine's main line (60 half-moves): +52 → +51 → +20 → 0
Position facts
- Mirror twin: position #146
- The king starts on b, the rooks on a and f
- King and rook are neighbours — castling from adjacent squares feels unusual
- It becomes the daily position in 313 days
Puzzles from this position
- Attack on the uncastled king: rook to d1 (f1) — Chess960 specifics · 780
- Attack on the uncastled king: king to a2 (b1·2) — Chess960 specifics · 970
- Attack on the uncastled king: bishop to d5 (h1·28) — Chess960 specifics · 1060
- Winning blow: queen to b6 (b3) — Chess960 specifics · 1200
- Winning blow: rook to e6 (e3·4) — Chess960 specifics · 1420
- Mate in 3: rook to c8 (c5) — Chess960 specifics · 1630
- Winning blow: knight to d7 (e5·18) — Chess960 specifics · 1650
- Winning blow: rook to c3 (c1·3) — Chess960 specifics · 1840
- Winning blow: pawn to b5 (a4·16) — Chess960 specifics · 1870
- Chess960 tactic on b7 (b4·2) — Chess960 specifics · 2400
This position appears in course day 205
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Commentary
The king begins on b1, and the rook already occupies f1, so short castling is a solo five-square walk to g1. The queen keeps her classical square d1, and the second rook is on a1. A bishop holds the corner on h1 with one diagonal to a8; the second bishop is on c1. On the second rank, h2 is the one that begins without a defender, and the knights are on e1 and g1. White's edge here is a wide one, +47 centipawns: a4 a5 e4 e5 Ne2 g6.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.